Queen Elizabeth, Britain’s longest reigning monarch, who died at the age of 96, had been president of the Women’s Institute branch in Sunningdale.
Prince William was wearing a dark jacket and tie, at a time of royal mourning for the Duchess of Kent, who died last Thursday.
This is also the anniversary of the accession to the throne of King Charles, who is spending the day in Balmoral in Scotland, where the late Queen died.
There has been speculation about whether Prince Harry will meet his father during his UK visit, with the two not having met face to face since February 2024, soon after King Charles had been diagnosed with cancer.
Prince Harry’s wife Meghan and their children have remained at their home in California.